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Unknown crystal
  
  Index -> What is it? - Where is it from?
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Donn C.




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PostPosted: Aug 09, 2022 20:37    Post subject: Unknown crystal  

Need help in identifying this crystal specimen. Got it many years ago in a small collection I bought. No ID info so I just put it away until now. The crystals about about ½ inch per side. I have some other questions about it as there are strange things going on inside it, but since its extremely difficult to do multiple photos I will have to try and add them later in a reply. The crystal will scratch with steel.


1 Unknown black crystal.jpg
 Mineral: unknown
 Description:
Locality: unknown
Size: 12mm x 12mm
 Viewed:  1116 Time(s)

1 Unknown black crystal.jpg


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Joseph DOliveira




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PostPosted: Aug 09, 2022 20:48    Post subject: Re: Unknown crystal  

Wulfenite ???

Donn C. wrote:
Need help in identifying this crystal specimen. Got it many years ago in a small collection I bought. No ID info so I just put it away until now. The crystals about about ½ inch per side. I have some other questions about it as there are strange things going on inside it, but since its extremely difficult to do multiple photos I will have to try and add them later in a reply. The crystal will scratch with steel.

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Bergur_E_Sigurdarson




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PostPosted: Aug 09, 2022 21:41    Post subject: Re: Unknown crystal  

Heavily included baryte?
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Matt_Zukowski
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PostPosted: Aug 09, 2022 21:44    Post subject: Re: Unknown crystal  

Hard to tell from just photos. Can you demount it and do a specific gravity?
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alfredo
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PostPosted: Aug 09, 2022 21:46    Post subject: Re: Unknown crystal  

Looks like barite to me.
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Donn C.




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PostPosted: Aug 09, 2022 22:14    Post subject: Re: Unknown crystal  

Matt_Zukowski wrote:
Hard to tell from just photos. Can you demount it and do a specific gravity?


Have no way to do that kind of test..
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John Cesar




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PostPosted: Aug 09, 2022 23:27    Post subject: Re: Unknown crystal  

Looks like Magma Mine, Superior, AZ barite.
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alfredo
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PostPosted: Aug 09, 2022 23:51    Post subject: Re: Unknown crystal  

I think John has got it! Check these photos here: https://www.mindat.org/gallery.php?loc=14241&min=549
Thanks. I am not familiar with this locality.
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James Catmur
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PostPosted: Aug 10, 2022 03:59    Post subject: Re: Unknown crystal  

Try reading this - I hope I have explained how to add multiple photos. There is a knack but it is real easy

https://www.mineral-forum.com/message-board/viewtopic.php?p=19493#19493

Donn C. wrote:
since its extremely difficult to do multiple photos
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James Catmur
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PostPosted: Aug 10, 2022 04:01    Post subject: Re: Unknown crystal  

This might help

https://www.mineral-forum.com/message-board/viewtopic.php?p=38375#38375

Donn C. wrote:
Matt_Zukowski wrote:
Hard to tell from just photos. Can you demount it and do a specific gravity?


Have no way to do that kind of test..
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James Catmur
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PostPosted: Aug 10, 2022 04:02    Post subject: Re: Unknown crystal  

I tend to agree but a test or two would help confirm it

https://www.mineral-forum.com/message-board/viewtopic.php?p=19487#19487

alfredo wrote:
I think John has got it! Check these photos here: https://www.mindat.org/gallery.php?loc=14241&min=549
Thanks. I am not familiar with this locality.
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Donn C.




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PostPosted: Aug 10, 2022 06:29    Post subject: Re: Unknown crystal  

Thanks for the information on the Magma Mine Barite I think that is probably correct. I am in Arizona and the specimen was bought here in Arizona. I looked through the photos and saw a couple that looked very much like mine. Now the question that I have is about the inclusions, which are quite interesting. The surface is covered with small black dots and they appear to have a dendrite like growth down into the crystal. The last photo is the best I can do for a micro-photo but you can see the growths going down into the crystal from the top edge and growing to the right from the left edge. Under high magnification they appear to be a series of spheres growing in a long straight chain. What are the black growth inclusions? With any luck all the photos should should be attached...


2 unknown crystal black dots.jpg
 Mineral: unknown
 Dimensions: 12mmx12mm
 Description:
 Viewed:  921 Time(s)

2 unknown crystal black dots.jpg



3 unknown black crystal backlight .jpg
 Mineral: unknown
 Dimensions: 12mmx12mm
 Description:
 Viewed:  921 Time(s)

3 unknown black crystal backlight .jpg



4 unknown black crystal dendrites.jpg
 Mineral: unknown
 Dimensions: 12mmx12mm
 Description:
 Viewed:  919 Time(s)

4 unknown black crystal dendrites.jpg


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Michael Shaw
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PostPosted: Aug 10, 2022 08:45    Post subject: Re: Unknown crystal  

The black spherical inclusions are probably one of the manganese oxides or goethite.
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Pete Richards
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PostPosted: Aug 10, 2022 09:18    Post subject: Re: Unknown crystal  

The "dendrites" extending into the barite are more of the same material that forms the dots on the surface. They indicate that the barite and the black material were forming at the same time for the later part of crystal growth. At the end, the black stuff continued to grow for a bit longer, forming the little hemispheres.

This interesting relationship is not uncommon, but is often not noticed.

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James Catmur
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PostPosted: Aug 10, 2022 09:28    Post subject: Re: Unknown crystal  

Perfect

Donn C. wrote:
With any luck all the photos should should be attached...
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Tony L. Potucek




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PostPosted: Aug 10, 2022 10:44    Post subject: Re: Unknown crystal  

John is correct. This is a Magma Mine, Superior AZ barite. I don't have the published articles in front of me; however, the inclusions could be several minerals, which have been previously identified as chalcocite, stromeyerite, chalcopyrite and sphalerite.
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Donn C.




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PostPosted: Aug 10, 2022 11:23    Post subject: Re: Unknown crystal  

OK, thanks everyone for the information it turned out to be an interesting little specimen..
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